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Deprecated: LLVM no longer features runtime control of multithreading support

This function used set the multithreading mode of LLVM, but that feature no longer exists. Threading is
controlled only at runtime with the configure flag --enable-threads (default is YES). This function will
now check that the the compiled-in multithreading support (returned by isMultithreaded) is
sufficient to support the requested access, and fail if not, so as to prevent uncontrolled use of a
version of LLVM compiled to be capable only of singled threaded use by haskell code requesting
multithreading support.